Seriously? Are you ******* retarded? What aren't you understanding? They would have checked more than prints. They would have checked ballistics, seen HIS prints on the gun, etc. That means they would check the angle, how far away, surrounding area showing any form of break in, study his body during autopsy to check if he was in a struggle, checked for gunpowder around the area, to confirm that the shot was taken from a close distance... They wouldn't just say "ohh he has the gun it was suicide". ******* ******** god damn, you're the reason people are uneducated when dealing with firearms.

Well there's many more factors then just that. A postmortem can determine the angle of impact when the shots came in, showing how close the gun was and from where it was firing. If there are no signs of a breaking and entering (door is still locked, window is closed and untouched etc.) then you can determine if anyone came in. There could also be evidence indicating whether or not he had depression issues before dying, or whether or not somebody he new had a motive for killing him.

There's a lot more information to glean than you would think, so long as you have the right people looking in the right places.